Lake Texcoco is a lake in Mexico. The lake was formed on a closed basin, with no drains, so it was salty. It occupied a great extension of the Anahuac valley, forming part of system of five lakes, between 2,270 and 2,750 meters above sea level, in the northern part of the Mexican highlands. Jump to: navigation, search A Lake is a body of water surrounded by land. ... Jump to: navigation, search In chemistry, salt is a term used for ionic compounds composed of positively charged cations and negatively charged anions, so that the product is neutral and without a net charge. ... Anahuac is a plateau in Central Mexico, at a mean elevation of 7580 ft. ...

Tenochtitlán was founded on an islet in the western part of the lake in the year 1325. The Aztecs created a large artificial island using a system similar to the creation of chinampas. To overcome the problems of drinking water, the Aztecs built a system of dams to separate the salty waters of the lake, with the rain water of the effluents. It also permitted them to control the level of the lake. The city also had an inner systems of channels that helped to control the water. Plan of Tenochtitlan (Dr Atl) Mexico City statue commemorating the foundation of Tenochtitlan Tenochtitlan (pronounced ) or, alternatively, Mexico-Tenochtitlan, was the capital of the Aztec empire, which was built on an island in Lake Texcoco in what is now central Mexico. ... Events Muhammed Tughlaq succeeds his father Ghiyas al-Din Tughlaq as Sultan of Delhi. ... The word Aztec is usually used as a historical term, although some contemporary Nahuatl speakers would consider themselves Aztecs. ... Before Mexico City, Tenochtitlan was an artificial island of 250,000 (Dr Atl) Dejima, not allowed direct contact with nearby Nagasaki Formoza (Gdynia) An artificial island is an island that has been formed by human, rather than natural means. ... Chinampa is an Aztec term referring to a method of ancient Mesoamerican agriculture through floating gardens—small, rectangle-shaped areas of fertile arable land used for agriculture in the Xochimilco region of the Basin of Mexico. ... Scrivener Dam, Canberra Australia, was engineered to withstand a once-in-5000-years flood event A dam is a barrier across flowing water that obstructs, directs or retards the flow, often creating a reservoir, lake or impoundment. ... In the context of creating Plutonium at the Hanford Site, effluent refers to the cooling water that is discharged from a nuclear reactor that may or may not be radioactive. ...

During Cortés's siege of Tenochtitlán, the dams were destroyed, and never rebuilt, so inundations became a big problem for the new Mexico City built over Tenochtitlán. In colonial times, Mexico City suffered from periodic inundations; in 1604 the lake overran the city and in 1607 there was an even more severe inundation. Under the direction of Enrico Martínez (Spanish version of Heinrich Martin), a drain was built to control the level of the lake, but in 1629 another inundation kept most of the city covered for five years. In that time it was debated whether to relocate the city, but the Spanish authorities decided to keep the current location. Map of Tenochtitlan, Mural painting from the National Museum of Mexico City. ... Jump to: navigation, search Hernán Cortés Hernán(do) Cortés, marqués del Valle de Oaxaca (1485–December 2, 1547) was the conquistador who conquered Mexico for Spain. ... Jump to: navigation, search Mexico City (Spanish: Ciudad de México) is the name of a megacity located in the Valley of Mexico (Valle de México), a large valley in the high plateaus (altiplano) at the center of Mexico, about 2,240 metres (7,349 feet) above sea-level... Events January 14 – Hampton Court conference with James I of England, the Anglican bishops and representatives of Puritans September 20 – Capture of Ostend by Spanish forces under Ambrosio Spinola after a three year siege. ... Events January 20 - Tidal wave swept along the Bristol Channel, killing 2000 people. ...

Eventually the lake was drained, via channels and a tunnel to the Pánuco River, but even that could not stop inundations, since by then most of the city was under the phreatic level. The inundations could not be completely controlled until the twentieth century. Río Pánuco or the Pánuco River is a river in Veracruz, Mexico. ...

The ecologial consequences of the draining were enormous. Parts of the valleys were turned semi-desertic, and even today the city suffers for lack of water. Current pumping of water from underground is one of the reasons Mexico City is sinking at a rate of a few centimeters every year.

The lake now occupies only a small area surrounded by salt marshes 2 1/2 mi (4 km) east of Mexico City. This article is about marsh, a type of wetland. ...

External link

• http://www.uaemex.mx/plin/psus/rev2/b03.html